Prefabricated bathroom and methods for constructing and installing the same

ABSTRACT

Disclosed herewith a prefabricated bathroom and a construction method and an installation method thereof. The prefabricated bathroom includes a bottom unit ( 11 ), multiple wall units ( 12 ) and a top plate unit ( 13 ). One of the wall units ( 12 ) is a structural wall ( 14 ), which is provided with a recessed top region ( 141 ) reserved for later pouring, a middle full-prefabricated structural wall body ( 142 ), and a recessed bottom region ( 143 ) reserved for later pouring. Top exposed reserve bars ( 144 ) of the prefabricated bathroom of a floor are inserted into the recessed bottom region ( 143 ) of the prefabricated bathroom of a next floor, and connected with bottom exposed reserve bars ( 146 ) thereof, so that the prefabricated bathroom of said floor can be connected with that of said next floor through pouring concrete in the recessed top region ( 141 ) and the recessed bottom region ( 143 ).

TECHNICAL FIELD

The invention relates to buildings, more specifically to a prefabricatedbathroom and methods for constructing and installing the prefabricatedbathroom. The invention can be widely applied in a variety of high-risebuildings.

BACKGROUND

Bathroom is an essential part of residential or commercial buildings.Currently, there are two ways for constructing the bathroom. One is touse cast-in-situ concrete frame at a construction site directly, andthen build the bathroom one plate by one plate. This is the mostconventional bathroom constructing method widely used, which, however,takes a long construction period with a high construction cost.Moreover, since the building materials used may be out of standard,quality of the bathroom thus built cannot be satisfactorily ensured. Theother way is to prefabricate a whole-set bathroom at factories, and thendeliver it to the construction site for installation.

Chinese Utility Model Patent No. 201520298272.4 discloses aprefabricated bathroom, wherein four walls of the prefabricated bathroominclude at least one wall, or part of at least one wall, that is asemi-prefabricated structural wall, which has a relatively smallthickness. An outer surface of the semi-prefabricated structural wall isprovided, along a normal direction thereof, with a plurality ofprotruding columns, each top surface thereof being provided with a boltfor accurately positioning and installing a cast-in-situ wall template.Therefore, the bolt, which is used for fixing the prefabricatedbathroom, can pass through the protruding column, which is used forfixing the cast-in-situ wall template. The above construction method hasthe following disadvantages. Specifically, the installation isinconvenient and the procedure thereof is complicated; a large amount ofconstruction materials have to be delivered, so that the cost issignificant; the construction is inconvenient and time consuming; andthe prefabricated bathroom is not equipped with bathtub and bathroom, sothat the facility is not complete.

SUMMARY OF THE INVENTION

Based on the above-mentioned disadvantages, the present invention aimsto provide a prefabricated bathroom, which has a satisfactory bearingcapacity, and can be constructed conveniently without use of protrudingcolumns and in-situ casting.

The prefabricated bathroom according to the present invention comprisesa bottom unit, multiple wall units and a top plate unit that areconnected to each other in a securing manner. One of the wall units is astructural wall, which is provided, at its top portion, with a recessedtop region reserved for later pouring, the recessed top region beingprovided therein with top exposed reserve bars. The structural wall isconfigured as a full-prefabricated structural wall body at its middleportion, and is provided, at its bottom portion, with a recessed bottomregion reserved for later pouring, the recessed bottom region beingprovided therein with bottom exposed reserve bars. The top exposedreserve bars of the prefabricated bathroom of a floor are inserted intothe recessed bottom region of the prefabricated bathroom of a nextfloor, and connected with the bottom exposed reserve bars thereof, sothat the prefabricated bathroom of said floor can be connected with theprefabricated bathroom of said next floor through pouring concrete inthe recessed top region and the recessed bottom region.

In one embodiment, the bottom plate unit and the low portions of thewall units are provided with a glass reinforced plastic material layer.

In one embodiment, the recessed top region and the recessed bottomregion are arranged on an outer side of the structural wall, and theinner sides of the recessed top region and the recessed bottom regionare provided with toothed engagement surfaces respectively.

In one embodiment, the prefabricated bathroom is provided therein with atoilet and a bathtub.

In one embodiment, one of the wall units other than the structural wallextends outwardly to form an exterior wall unit, the end of which isprovided with side exposed reserve bars.

The present invention further proposes a method for constructing theprefabricated bathroom, comprising the following steps: building thebottom plate unit and the lower portions of said multiple wall unitswith a bottom plate steel mold and a vertical steel mold, bundling thebars of the bottom plate unit and the wall units, and pouring concrete;forming the recessed bottom region reserved for later pouring at abottom part of the structural wall, and providing exposed bars in therecessed bottom region; building the upper portions of said multiplewall units and the top plate unit with a vertical steel mold of the wallunits and a top mold arranged at the top of the top plate unit, bundlingthe bars of the top plate unit and the wall units, and pouring concrete;and forming the recessed top region reserved for later pouring at a toppart of the structural wall, and providing exposed bars in the recessedtop region.

In one embodiment, the step for building the bottom plate unit and thelower portions of said multiple wall units further includes: disposingthe glass reinforced plastic material layer at a position of the bottomplate unit before bundling the bars of the bottom plate unit and thewall units, wherein edges of the glass reinforced plastic material layerextend upwardly to the lower portions of the wall units.

The present invention further proposes a method for installing theprefabricated bathroom, comprising the following steps: Step A, liftingthe prefabricated bathroom to a designated position of a floor plate ofa floor to be installed with the prefabricated bathroom; Step B,bundling the bottom exposed reserve bars of the recessed bottom regionof the structural wall with the top exposed reserve bars of theprefabricated bathroom of a next floor that are inserted into saidrecessed bottom region together, forming a bar mesh; and Step C,installing a cast-in-situ wall template outside said recessed bottomregion, and pouring concrete in said recessed bottom region to form acast-in-situ wall.

In one embodiment, after Step C the method further includes: Step D,establishing scaffolds around the prefabricated bathroom of said floorat positions where the floor plate is poured, and lifting asemi-prefabricated floor plate to the prefabricated bathroom andmounting it on the top of the scaffolds; and Step E, bundling bars onthe top of prefabricated bathroom and on the top of thesemi-prefabricated floor plate to form a bar mesh, on which concrete ispoured to form the whole floor plate.

In one embodiment, in Step F, concrete is further poured in the recessedtop region of the prefabricated bathroom of said next floor duringpouring the floor plate.

Compared with the prior arts, the present invention has the followingtechnical advantages. First, one of the wall units is a structural wall,which increases the bearing capacity, and enables the bathroom beingconstructed stronger. Second, according to the present invention, thetop exposed reserve bars of the prefabricated bathroom on a floor areinserted into the recessed bottom region of the prefabricated bathroomon an upper floor and connected with the bottom reserved bars thereof.By means of which, precise positioning and installing procedures areunnecessary, and protruding columns and bolts are also dispensed.Therefore, the construction process is greatly facilitated and theconstruction efficiency is improved. Third, according to theconstructing method for the prefabricated bathroom of the presentinvention, the bottom plate unit and the bottom portions of the wallunits are poured with concrete as a whole in one time, and the top plateunit and the top portions of the wall units are poured with concrete asa whole in one time. Therefore, the construction process is facilitated,the joints formed are tight, and the waterproof performance of theprefabricated bathroom is improved. Finally, according to the installingmethod for the prefabricated bathroom of the present invention, the topexposed reserve bars of the prefabricated bathroom on a floor areinserted into the recessed bottom region of the prefabricated bathroomon a next floor and connected with the bottom reserved bars thereof, andthrough pouring concrete in the recessed top region reserved for laterpouring and the recessed bottom region reserved for later pouring, theprefabricated bathroom of said floor is connected with the prefabricatedbathroom of said next floor. By means of which, precise positioning andinstalling procedures are unnecessary, and protruding columns and boltsare also dispensed. Therefore, the construction process is greatlyfacilitated and the construction efficiency is improved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 schematically shows the whole structure of a prefabricatedbathroom according to the present invention;

FIG. 2 schematically shows the step of building an outer steel mold forthe bottom plate and a vertical steel mold of the wall unit in theconstruction method for the prefabricated bathroom according to thepresent invention;

FIG. 3 schematically shows the step of disposing a glass reinforcedplastic material layer in the outer steel mold for the bottom plate;

FIG. 4 schematically shows the step of bundling lateral bars withvertical bars of the bottom plate unit and the wall units in theconstruction method for the prefabricated bathroom according to thepresent invention;

FIG. 5 schematically shows the step of pouring concrete, forming thebottom plate unit and the wall units of the prefabricated bathroom inthe construction method for the prefabricated bathroom according to thepresent invention;

FIG. 6 schematically shows the step of removing the steel molds exceptthe bottom plate mold in the construction method for the prefabricatedbathroom according to the present invention;

FIG. 7 schematically shows the step of removing the steel mold butleaving the final structure of the bottom plate mold in the constructionmethod for the prefabricated bathroom according to the presentinvention;

FIG. 8 schematically shows the step of installing a vertical outer steelmold in the construction method for the prefabricated bathroom accordingto the present invention;

FIG. 9 schematically shows the step of installing an aluminum windowframe in the construction method for the prefabricated bathroomaccording to the present invention;

FIG. 10 schematically shows the step of bundling lateral bars withvertical bars in the construction method for the prefabricated bathroomaccording to the present invention;

FIG. 11 schematically shows the step of installing a flange support anda single top support in the construction method for the prefabricatedbathroom according to the present invention;

FIG. 12 schematically shows the step of installing a screw shaft in theconstruction method for the prefabricated bathroom according to thepresent invention;

FIG. 13 schematically shows the step of pouring concrete in theconstruction method for the prefabricated bathroom according to thepresent invention;

FIG. 14 schematically shows the step of removing the molds in theconstruction method for the prefabricated bathroom according to thepresent invention;

FIG. 15 schematically shows the step of hoisting and transferring theproduct after removing the molds in the construction method for theprefabricated bathroom according to the present invention;

FIG. 16 schematically shows the step of laying concrete slurry in theinstallation method for the prefabricated bathroom according to thepresent invention;

FIG. 17 schematically shows the step of hoisting and installing theprefabricated bathroom in the installation method for the prefabricatedbathroom according to the present invention;

FIG. 18 schematically shows the step of installing foot stools anddiagonal bracings in the installation method for the prefabricatedbathroom according to the present invention;

FIG. 19 schematically shows the step of bundling bars at an outside ofthe structural wall and bundling bars at a later-pouring region of theexterior wall in the installation method for the prefabricated bathroomaccording to the present invention;

FIG. 20 schematically shows the step of installing templates for thecast-in-situ wall and the later-pouring region of the exterior wall, andpouring concrete in the installation method for the prefabricatedbathroom according to the present invention;

FIG. 21 schematically shows the step of removing foot stools anddiagonal bracings in the installation method for the prefabricatedbathroom according to the present invention;

FIG. 22 schematically shows the step of establishing scaffolds in theinstallation method for the prefabricated bathroom according to thepresent invention;

FIG. 23 schematically shows the step of installing a semi-prefabricatedfloor plate in the installation method for the prefabricated bathroomaccording to the present invention;

FIG. 24 schematically shows the step of bundling the bars of thesemi-prefabricated floor plate and the bars at the top of the bathroom,embedding light control boxes, wire conduits and related accessories,and pouring concrete in the installation method for the prefabricatedbathroom according to the present invention;

FIG. 25 schematically shows a plurality of floors each having aprefabricated bathroom installed thereon; and

FIG. 26 schematically shows a horizontal cross sectional view of theplan structure of the prefabricated bathroom according to the presentinvention.

PREFERRED EMBODIMENTS OF THE INVENTION

In the following the present invention will be described in details withreference to the attached drawings and embodiments in order to enablethe objective, technical solution and advantages of the presentinvention being more distinct. It should be understood that theparticular embodiments as set forth herewith are intended to beillustrative, not to limit the scope of the invention in any way.

As shown in FIGS. 1 and 26, the prefabricated bathroom 100 according tothe invention comprises a bottom plate unit 11, a plurality of wallunits 12, and a top plate unit 13 that are connected to each other in asecuring manner. The prefabricated bathroom 100 is further providedtherein with a bathroom 19 and a bathtub 18. The wall unit 12 may beprovided with a door and/or a window, and pre-embedded therein withwater supply/drainage pipes, wire conduits, and light control boxes. Atleast one of said plurality of wall units 12 is a main structural wall14. The main structural wall 14 has a relatively large thickness, andthus requires a large amount of bars. The use of the main structuralwall 14 can increase the bearing capacity of the wall, enabling thebathroom being constructed stronger.

One or more of the wall units 12 other than the structural wall 14 mayextend outwardly to form an exterior wall unit 20, the end of which maybe provided with side exposed reserve bars 21. During construction, thelength of the exterior wall unit 20 can be prefabricated according tothe on-site size. During the on-site installation of the prefabricatedbathroom, transverse bars and vertical bars can be provided at the sideexposed reserve bars 21, so as to form a side bar mesh 16 (see FIG. 19).Then, a cast-in-situ wall template is installed, so that the exteriorwall unit 20 can be connected with other prefabricated structures orcast-in-situ structures by pouring concrete therewith. The prefabricatedbathroom and the extending exterior wall unit 20 are prefabricated intoone piece, thus reducing the possibility of water seepage in thebathroom, and improving the waterproof performance of the bathroom.

The structural wall 14 has: a recessed top region 141, which is, as asemi-prefabricated structure, reserved for later pouring; a middleregion 142, which is a full-prefabricated structural wall body; and arecessed bottom region 143, which is, also as a semi-prefabricatedstructure, reserved for later pouring. The recessed top region 141reserved for later pouring is provided with top exposed reserve bars144, and the recessed bottom region 143 reserved for later pouring isprovided with bottom exposed reserve bars 146. In order to increase thebonding force between the prefabricated concrete and the cast-in-situconcrete, a tooth-shaped engaging surface may be provided on inner wallsof the recessed top region 141 reserved for later pouring and therecessed bottom region 143 reserved for later pouring. The top exposedreserve bars 144 of the prefabricated bathroom 100 on a floor areinserted into the recessed bottom region 143 of the prefabricatedbathroom 100 on an upper floor, and connected to the bottom exposedreserve bars 146 thereof. Through pouring concrete in the recessed topregion 141 reserved for later pouring and the recessed bottom region 143reserved for later pouring, the prefabricated bathroom 100 of said flooris connected with the prefabricated bathroom 100 of said upper floor.The recessed top region 141 reserved for later pouring and the recessedbottom region 143 reserved for later pouring can achieve the connectionbetween the structural walls 14 of two adjacent floors after pouringconcrete. In addition, the recessed top region 141 reserved for laterpouring can be also used for mounting a cast-in-situ beam, and thereinforcing bars in the recessed top region 141 can be arranged inaccordance with said beam.

According to the present invention, the bottom plate unit 11 and thelower portion of each of the wall units 12 are each provided with aglass fiber reinforced plastic material layer 103, which can not onlyincrease the toughness of the bottom plate, but also prevent waterleakage. In a preferred embodiment, the glass fiber reinforced plasticmaterial layer 103 in the bottom plate unit 11 is formed into one piecewith those in the lower portions of the wall units 12. The top plateunit 13, as a part of a structural floor plate of building, is embeddedtherein with pipelines and light control boxes. The thickness of the topplate unit 13, e.g., about 70 mm, is smaller than the overall thicknessof the building floor plate. Therefore, the use of templates can bereduced during construction, the pressure from the top plate can bereduced, and the construction difficulty and the consumption of buildingmaterials can be both reduced.

In the following the construction method of the prefabricated bathroomaccording to the present invention will be described. The constructionmethod is shown in FIGS. 2 to 15, and includes the following steps.

1. Construction of the bottom plate unit 11 and the lower portions ofthe wall units 12

In Step 1, outer steel molds are arranged. Specifically, as shown inFIG. 2, an outer steel mold 101 for the bottom plate of the bottom plateunit 11 of the prefabricated bathroom 100 and a first vertical outersteel mold 102 for four wall units 12 are established. The outer steelmold 101 for the bottom plate and the first vertical outer steel mold102 are each designed as an integral template structure, which can meetthe strength, rigidity and stability requirements for the prefabricatedbathroom 100 during construction, and ensure no deformation, damages orcollapse of the prefabricated bathroom 100 during production. The outersteel mold 101 for the bottom plate and the first vertical outer steelmold 102 are each assembled and disassembled as a whole, ensuring thecomponents thereof have correct shapes, sizes, and mutual positionrelationship. In the meantime, the structure is simple, the assembly anddisassembly are convenient, the surface of the mold is flat, and thejoint is tight so that no leakage would occur.

In Step 2, a glass fiber reinforced plastic material layer is arranged.Specifically, as shown in FIG. 3, the glass fiber reinforced plasticmaterial layer 103 is placed on inner sides of the outer steel mold 101for the bottom plate and the first vertical outer steel mold 102.

In Step 3, a structural bar mesh is formed. Specifically, as shown inFIG. 4, transverse bars 161 and vertical bars 162 are firmly bundled bywires and fastened to the inner sides of the outer steel mold 101 forthe bottom plate and the first vertical outer steel mold 102, so as toform a structural bar mesh for four wall units 12 and the bottom plateunit 11. The structural bar mesh is then embedded with drainagepipelines and light control boxes, respectively. The structural bar meshof said four wall unit 12 and said bottom plate unit 11 is formed by onesingle process, thus maintaining the integrity of the prefabricatedbathroom.

In Step 4, inner steel molds are arranged. Specifically, an inner steelmold 104 for the bottom plate of the bottom plate unit 11 of theprefabricated bathroom 100 and a first vertical inner steel mold 105 forfour wall units 12 are established.

In Step 5, at a position of the lower portion of the structural wall 14corresponding to the recessed bottom region 143 reserved for laterpouring, a region is reserved for later pouring, in which bottom exposedreserve bars 146 are provided.

In Step 6, a first concrete 106 is poured. Specifically, as shown inFIG. 5 to FIG. 7, the first concrete 106 conforming to relatedrequirements is poured into a space defined by the outer steel mold 101for the bottom plate, the inner steel mold 104 for the bottom plate, thefirst vertical outer steel mold 102, and the first vertical inner steelmold 105. After the first concrete 106 reaches required strength, themolds except the outer steel mold 101 are removed, thus forming thelower portions of four wall units 12 of the prefabricated bathroom 100and the bottom plate unit 11. The bottom plate unit 11 consists of theglass fiber reinforced plastic material layer 103 and the first concrete106.

2. Construction of the upper portions of the wall units 12 and the topplate unit 13

In Step 7, outer steel molds are arranged. Specifically, as shown inFIG. 8, a second vertical outer steel mold 107 is arranged on the outerside of the wall units 12 that have been poured, and a pouring portionis reserved at a position corresponding to the recessed top region 141reserved for later pouring. At the same time, the top exposed reservebars 144 are provided in the pouring portion. Then, the bottom plateunit 11 and the wall units 12 are fixed together.

In Step 8, an aluminum window frame 1 is installed. Specifically, asshown in FIG. 9 and FIG. 10, the aluminum window frame 1 is mounted onone of the wall units 12, and transverse bars 161 and vertical bars 162are firmly bundled by wires and fastened on the inner side of the secondvertical outer steel mold 107, thus forming a surrounding bar mesh.Then, the light control boxes and the conduits are separately fixed andembedded in the surrounding bar mesh.

In Step 9, a second vertical inner steel mold is established.Specifically, a second vertical inner steel mold (not shown) for thewall units 12 is established.

In Step 10, a top mold is installed. Specifically, as shown in FIG. 11,a flange support 2 and a single top support 3 are installed, so that thevertical steel molds can be kept vertical and firm by adjusting theflange support 2. The top mold is installed on the single top support 3,and bars are provided on the top mold, and formed into one piece withthe bars of the wall units 12. Then, embedded light control boxes andconduits are fixed on the top mold.

In Step 11, size adjustment is performed. Specifically, as shown in FIG.12, a screw shaft 4 is mounted on the top, in order to support the moldand adjust the size thereof, so that the mold can conform to theprefabricated bathroom 100 in terms of size.

In Step 12, a second concrete 108 is poured. Specifically, as shown inFIG. 13, a second concrete 108 is poured in a space defined by thevertical outer steel molds and the vertical inner steel molds of thewall units 12 and the top mold of the top plate unit 13. As shown inFIG. 14, after the second concrete 108 reaches required strength, allthe molds, supports or the like are removed. Then, the product can belifted to the area where the prefabricated bathroom 100 is decorated.

Since a portion for pouring the recessed bottom region 143 and thebottom exposed reserve bars 146 are provided in Step 5, and a portionfor pouring the recessed top region 141 and the top exposed reserve bars144 are provided in Step 7, the recessed bottom region 143 reserved forlater pouring and the bottom exposed reserve bars 146 will be formed atthe lower portion of the structural wall 14, while the recessed topregion 141 reserved for later pouring and the top exposed reserve bars144 will be formed at the upper portion of the structural wall 14, afterthe concrete is poured.

The prefabricated bathroom 100 according to the present invention can beconstructed through the above-mentioned steps. As shown in FIG. 15,through engagement of a steel hook 6 with a hanger 5, the prefabricatedbathroom 100 can be lifted and transferred to a designated place forinstallation.

In the following the on-site installation method of the prefabricatedbathroom 100 according to the present invention will be described. Theon-site installation method is as shown in FIGS. 16 to 25, and includesthe following steps.

In Step 1, a floor for installing the prefabricated bathroom 100 isdesignated, and accordingly, a top plate 7 of the floor is cleaned.

In Step 2, as shown in FIG. 16, a layer of concrete mortar is applied onthe top of the cleaned floor 7 in a region where the prefabricatedbathroom 100 is placed.

In Step 3, as shown in FIG. 17, the prefabricated bathroom 100 is liftedto the designated position on the installation site. At this time, thetop exposed reserve bars 144 of the bathroom of a next floor areinserted into the recessed bottom region 143 reserved for later pouringof the prefabricated bathroom of said floor.

In Step 4, as shown in FIG. 18, foot stools 8 and diagonal bracings 9are mounted to fix the prefabricated bathroom 100 on the top plate 7 ofsaid floor;

In Step 5, as shown in FIG. 19, the bottom exposed reserve bars 146 inthe recessed bottom region 143 reserved for later pouring of theprefabricated structural wall 14 are bundled with the top exposedreserve bars 144 of said next floor, and the vertical bars 162 arebundled with the transverse bars 161, forming the structural wall barmesh 30. In addition, the side exposed reserve bars 21 at the end of theexterior wall unit 20 are bundled with the transverse bars 161 and thevertical bars 162, thus forming the bar mesh 16.

In Step 6, as shown in FIG. 20, cast-in-situ wall templates areinstalled at positions respectively corresponding to the recessed bottomregion 143 reserved for later pouring and the bar mesh 16 arranged atthe end of the exterior wall unit 20. The concrete which meets relatedrequirements is poured into the cast-in-situ wall templates, thusforming the cast-in-situ structural wall 10 and the exterior wall.

In Step 7, as shown in FIG. 21, the foot stools 8 and the diagonalbracings 9 are removed.

In Step 8, as shown in FIG. 22, scaffolds 15 are established around theprefabricated bathroom 100, for supporting a semi-prefabricated floorplate 17.

In Step 9, as shown in FIG. 23, the semi-prefabricated floor plate 17 ishoisted on the top of the scaffolds 15.

In Step 10, as shown in FIG. 24, bars at the top of thesemi-prefabricated floor plate 17 and bars at the top of the bathroomare bundled together, the light control boxes, the conduits and relatedaccessories are embedded, and then concrete is poured on the bars.

In Step 11, as shown in FIG. 25, the above steps 1 to 10 are repeated.

The advantages of the present invention are as follows.

1. One of the wall units 12 is a structural wall 14, which increases thebearing capacity.

2. The top and bottom regions of the structural wall 14 are bothsemi-prefabricated, while the middle region thereof is afull-prefabricated structural wall. Therefore, the integrity of thestructural wall 14 is ensured.

3. The bottom plate unit 11 is composed of a concrete layer and theglass reinforced plastic material layer 103. Therefore, the bottom plateunit 11 has improved toughness, and can effectively prevent waterseepage.

4. The prefabricated bathroom 100 is provided with the toilet 19 and thebathtub 18, so that it is more convenient to use.

5. The top plate unit 13 has a smaller thickness than that ofconventional prefabricated bathrooms 100. Therefore, the use oftemplates can be reduced during construction, the pressure from the topplate on the wall units 12 can be reduced, and the constructiondifficulty and the consumption of building materials can be reduced.

6. According to the construction method for the prefabricated bathroomof the present invention, the bottom outer steel mold 102 and the firstvertical outer steel mold 102 are each assembled and disassembled as awhole, and the top plate unit 13 and the upper portions of thesurrounding wall units 12 are formed by pouring concrete once, thusobtaining tight joints without slurry leakage. Therefore, the waterproofperformance of the prefabricated bathroom 100 is improved.

7. According to the installation method for the prefabricated bathroomof the present invention, the top exposed reserve bars 144 of theprefabricated bathroom 100 of a floor are inserted into thesemi-prefabricated toothed joint of the prefabricated bathroom 100 of anext floor, and connected with the bottom exposed reserve bars 146thereof. Therefore, accurate installing and positioning procedure isunnecessary, and the construction efficiency is improved.

While the invention has been described in conjunction with the preferredembodiments outlined above, it is evident that many alternatives,modifications and variations will be apparent to those skilled in theart. Various changes may be made without departing from the spirit andscope of the invention as defined in the following claims.

The invention claimed is:
 1. A prefabricated bathroom, comprising abottom plate unit (11), multiple wall units (12) and a top plate unit(13) that are connected to each other in a securing manner, wherein oneof the wall units (12) is a structural wall (14), which is provided, atits top portion, with a recessed top region (141) reserved for laterpouring, the recessed top region (141) being provided therein with topexposed reserve bars (144), and wherein the recessed top region of thestructural wall is an upwardly facing recessed top region that includesa laterally facing surface and extends a longitudinal extent the entirewidth of the structural wall, said structural wall (14) is configured asa full-prefabricated structural wall body (142) at a middle portion ofthe structural wall (14), and is provided, at a bottom portion of thestructural wall (14), with a recessed bottom region (143) reserved forlater pouring, the recessed bottom region (143) being provided thereinwith bottom exposed reserve bars (146), and wherein the recessed bottomregion of the structural wall is a downwardly facing recessed bottomregion that includes a laterally facing surface and extends alongitudinal extent the entire width of the structural wall, and the topexposed reserve bars (144) of a prefabricated bathroom located on afloor are inserted into the recessed bottom region (143) of aprefabricated bathroom located on a next floor, and connected with thebottom exposed reserve bars (146) thereof, so that the prefabricatedbathroom of said floor can be connected with the prefabricated bathroomof said next floor through pouring concrete in the recessed top region(141) and the recessed bottom region (143), wherein the top exposedreserve bars of the prefabricated bathroom located on the floor areinserted into the downwardly facing recessed bottom region of theprefabricated bathroom located on a next floor and joined with thebottom exposed reserve bars thereof, whereby the prefabricated bathroomof the floor can be connected with the prefabricated bathroom of thenext floor through pouring concrete in the upwardly facing recessed topregion and the downwardly facing recessed bottom region.
 2. Theprefabricated bathroom according to claim 1, wherein the bottom plateunit (11) and low portions of the wall units (12) are provided with aglass reinforced plastic material layer (103).
 3. The prefabricatedbathroom according to claim 1, wherein the recessed top region (141) andthe recessed bottom region (143) are arranged on an outer side of thestructural wall (14), and inner sides of the recessed top region (141)and the recessed bottom region (143) are provided with toothedengagement surfaces (151, 152) respectively.
 4. The prefabricatedbathroom according to claim 1, wherein the prefabricated bathroom isprovided therein with a toilet (19) and a bathtub (18).
 5. Theprefabricated bathroom according to claim 1, wherein one of the wallunits (12) other than the structural wall (14) extends outwardly to forman exterior wall unit (20), an end of which is provided with sideexposed reserve bars (21).
 6. A method for constructing theprefabricated bathroom claim 1, comprising the following steps: Step A:building the bottom plate unit (11) and the lower portions of saidmultiple wall units (12) with a bottom plate steel mold and a verticalsteel mold, bundling the bars of the bottom plate unit (11) and the wallunits (12), and pouring concrete; Step B: forming the recessed bottomregion (143) reserved for later pouring at a bottom part of thestructural wall (14), and providing exposed bars in the recessed bottomregion (143); Step C: building the upper portions of said multiple wallunits (12) and the top plate unit (13) with a vertical steel mold of thewall units (12) and a top mold arranged at the top of the top plate unit(13), bundling the bars of the top plate unit (13) and the wall units(12), and pouring concrete; and Step D: forming the recessed top region(141) reserved for later pouring at a top part of the structural wall(14), and providing exposed bars in the recessed top region (141). 7.The method for constructing the prefabricated bathroom according toclaim 6, wherein Step A further includes: disposing the glass reinforcedplastic material layer at a position of the bottom plate unit (11)before bundling the bars of the bottom plate unit (11) and the wallunits (12), wherein edges of the glass reinforced plastic material layerextend upwardly to the lower portions of the wall units (12).
 8. Amethod for installing the prefabricated bathroom according to claim 1,comprising the following steps: Step A: lifting the prefabricatedbathroom (100) to a designated position of a floor plate of a floor tobe installed with the prefabricated bathroom; Step B: bundling thebottom exposed reserve bars (146) of the recessed bottom region (143) ofthe structural wall (14) with the top exposed reserve bars (144) of theprefabricated bathroom of a next floor that are inserted into saidrecessed bottom region (143) together, forming a bar mesh; and Step C:installing a cast-in-situ wall template outside said recessed bottomregion (143), and pouring concrete in said recessed bottom region (143)to form a cast-in-situ wall (10).
 9. The method for installing theprefabricated bathroom according to claim 8, wherein after Step C, themethod further includes, Step D: establishing scaffolds (15) around theprefabricated bathroom of said floor at positions where the floor plateis poured, and lifting a semi-prefabricated floor plate (17) to theprefabricated bathroom (100) and mounting it on the top of the scaffolds(15); and Step E: bundling bars on the top of prefabricated bathroom(100) and on the top of the semi- prefabricated floor plate (17) to forma bar mesh, on which concrete is poured to form the whole floor plate.10. The method for installing the prefabricated bathroom according toclaim 9, wherein in Step F, concrete is further poured in the recessedtop region (141) of the prefabricated bathroom (100) of said next floorduring pouring the floor plate.